<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title></title>
    <style>
    	.list{
    		background: tomato;
    		margin-bottom: 30px;
    		height: 200px;
    	}
    </style>
 <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <link rel="stylesheet" type="text/css" href="https://cdn.bootcss.com/twitter-bootstrap/4.3.1/css/bootstrap.min.css"/>
</head>
<body>
   <div class="container">
   	<div class="row">
   		<div class="col-md-4">
   			<div class="list">内容</div>
   		</div>
   		<div class="col-md-4">
   			<div class="row">
   				<div class="col-6">
   					<div class="list">内容</div>
   				</div>
   				<div class="col-6">
   					<div class="list">内容</div>
   				</div>
            <div class="col-6">
   					<div class="list">内容</div>
   				</div>

                 <div class="col-6">
   					<div class="list">内容</div>
   				</div>

   			</div>
   		</div>
   		<div class="col-md-4">
   			<div class="list">内容</div>
   		</div>
   </div>

</body>
</html>